I received my Xin supermini IV that I sent for upgrades in April 2007. Dr. Xin was very apologetic, after I sent a couple of reminders to him. I have posted the receipt of the amp in xin's forum as that is a similar thread there.

I believe he is working hard to fulfill the backlog.

Good luck guys!

Congratulations!

Thats kind of good news. Hopefully 17 months isn't going to be the average wait time though...

I received my Xin supermini IV that I sent for upgrades in April 2007. Dr. Xin was very apologetic, after I sent a couple of reminders to him. I have posted the receipt of the amp in xin's forum as that is a similar thread there.

I believe he is working hard to fulfill the backlog.

Good luck guys!

Wonder what went wrong there. I send mine in early november and had it back late january. Although that was not for upgrade but for repair.

I have never had a problem and I have a few (most of the models). There was a few problems with the battery contacts but that was a while ago. If Xin starts shipping regular everyone should be getting some great amps.

And the wait goes on ...

In July and August, I had sent two requests to Dr. Xin for a refund of the Paypal funds sent for a Reference order in August 2007. I never got a reply or the refund, so I just sent Dr. Xin another email asking him to disregard the requests for a refund and to keep the order in place.

So, 9/8/2008 was the 13 month anniversary of my order of a Xin Reference amp, for which I still wait and hope (I'm breathing normally though).

I have had 7 Xin amps (SuperMacro, SuperMacro-III, SuperMacro-LE, Reference, SuperMini-III, SuperMini-IV and SuperMicro-IV)and the only reliability problem I had was on the SuperMini-III where the input jack developed a loose connection after >2years of use. On the SuperMini-IV I got wierd sound when I disabled dc boost and used it with Tripple.fi 10 phones. Other than that they have all been very good. For pure sound the Reference won but my true love was always the SuperMini. If only Xin would start delivering on a reliable timeframe again and upgrade the SuperMini with all he has learned from the Refernce project I think it would be an awesome amp.

reliability

I have a SuperMicro III and a SuperMicro IV. I've had a lot of trouble with the thin copper battery contacts. Fortunately it's not difficult to jury rig something that works, because I'm certainly not going to send an amp back to Dr. Xin for repair. They do sound sweet though.

Maybe if I ever get the Reference I ordered I'll send the SM IV in for proper repair (and updating). One can dream.